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NCT Number: NCT04290533

HD-tDCS Over the dACC in High Trait Impulsivity

Psychological disorders characterized by impulsivity often show alterations in dorsal anterior cingulate cortex (dACC) activity. Recent research has therefore focused on non-invasive neurostimulation therapies for the modulation of functional activity in the dACC. To date there has only been one proof-of-concept study providing evidence for modulating dACC activity with non-invasive electrical neurostimulation (e.g. transcranial electrical stimulation). Since transcranial Direct Current Stimulation (tDCS) is relatively safe, tolerable, and mobile as compared to other neurostimulation techniques, it is worthwhile looking further into the effects of tDCS on functional dACC activity. The aim of the present research is to explore whether HD-tDCS can induce changes in the dACC in individuals with high trait impulsivity (N=20) in a double-blind cross-over study. Functional changes in dACC activity will be measured by the error related negativity (ERN), which is an event related potential generated by the dACC. The ERN is less pronounced in people that score high on impulsivity. It is therefore expect enhanced ERN amplitudes after HD-tDCS over the dACC. In addition, performance on the multisource interference task will be used as measure of dACC activity. It is hypothesize that increased dACC activity will be related to decreased impulsivity in high impulsive individuals as shown by improved inhibitory control on the Go/NoGo task. The results of the study may have implications for patient populations that are characterized by impulsivity.

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Key information

Conditions

Impulsive Behavior Behavior

Age range

18 year–55 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Monash University, BrainPark

Melbourne, Victoria, 3800, Australia

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Right-handed
  • Score > 46 on SUPPS-P

Exclusion criteria

  • Score low on trait impulsivity as determined by a score of < 47 on the SUPPS-P short form
  • History of DSM-5 defined neurological illness, mental illness or traumatic brain injury,
  • Currently taking any psychoactive medications,
  • Have metal anywhere in the head, except the mouth. This includes metallic objects such as screws, plates and clips from surgical procedures.
  • Currently pregnant or lactating,
  • Being left-handed

Treatment and study plan

Active High Definition transcranial Direct Current Stimulation (HD-tDCS)

Device

TDCS is a non-invasive neuromodulation technique that modulates membrane potentials by means of small electrical currents. Electrical currents induced by tDCS electrodes produce an electrical field that modulates the excitability of brain areas. In the present HD-tDCS montage, one anodal electrode and four return electrodes are applied. Hereby, the anodal electrode modulates the excitability of the targeted area, whereas the other 4 electrodes return electrical currents that flow away from that area. Direct currents will be transmitted through 5 circular PiStim electrodes of 3.14cm2 (Neuroelectrics, Barcelona, Spain; current density=0.32 mA/cm2) with a current intensity of 1.5 mA. The HD-tDCS session will last for 20 minutes in total, with a 60 sec ramp at the beginning and end of the session. The electrodes will be filled with conductive gel and plugged into an EEG cap, with the anode placed over Fz and the four return electrodes over Fp1, Fp2, F7, and F8 (10-20 system).

Sham High Definition transcranial Direct Current Stimulation (HD-tDCS)

Device

For the sham-condition, the placement of the electrodes was identical to active HD-tDCS stimulation with the anode placed over Fz and the four return electrodes over Fp1, Fp2, F7, and F8 (10-20 system). The direct current, also transmitted through 5 circular PiStim electrodes of 3.14cm2 (Neuroelectrics, Barcelona, Spain; current density=0.32 mA/cm2), was increased in a ramp-like fashion over 60 seconds until it reached 1.5 mA. Directly after ramp-up, the current intensity was gradually switched off over 60 seconds, followed by 20 minutes without active stimulation. Sham procedures for tDCS mimic the transient skin sensation at the beginning of active HD-tDCS, without producing any conditioning effects on the brain. Consequently, participants are reliably blinded for sham tDCS.

Primary outcomes

  1. Change in error related negativity (ERN) measured by electroencephalography (EEG) after active and sham HD-tDCS

    Time frame: Baseline, directly after (active vs. sham) HD-tDCS, and 30 min after (active vs. sham) HD-tDCS.

    To measure changes in electrophysiological measures of error processing after active vs. sham HD-tDCS

  2. Change in NoGo N2 measured by electroencephalography (EEG)

    Time frame: Baseline, directly after (active vs. sham) HD-tDCS, and 30 min after (active vs. sham) HD-tDCS.

    To measure changes in electrophysiological measures of early inhibitory control processes after active vs. sham HD-tDCS

  3. Change in NoGo P3 measured by electroencephalography (EEG) after active and sham HD-tDCS

    Time frame: Baseline, directly after (active vs. sham) HD-tDCS, and 30 min after (active vs. sham) HD-tDCS.

    To measure changes in electrophysiological measures of motor inhibitory control processes after active vs. sham HD-tDCS

Secondary outcomes

  1. Change in percentage of correct nogo trials on Go/NoGo task after active vs. sham HD-tDCS

    Time frame: Baseline, directly after (active vs. sham) HD-tDCS, and 30 min after (active vs. sham) HD-tDCS.

    To measure the effect of active vs. sham HD-tDCS on accuracy on trials for which responses have to be inhibited. Represents a measure of change in inhibitory control.

  2. Change in reaction times on Go trials during Go/NoGo task after active vs. sham HD-tDCS

    Time frame: Baseline, directly after (active vs. sham) HD-tDCS, and 30 min after (active vs. sham) HD-tDCS.

    To measure changes in speed of motor responses during Go/NoGo task differences after active vs. sham HD-tDCS

  3. Change in reaction times post incorrect trials during Go/NoGo task after active vs. sham HD-tDCS

    Time frame: Baseline, directly after (active vs. sham) HD-tDCS, and 30 min after (active vs. sham) HD-tDCS.

    To measure the effect of active vs. sham HD-tDCS on post-error slowing as behavioural measure of error processing.

  4. Change in interference effect on multisource interference task (MSIT) after active vs. sham HD-tDCS

    Time frame: Baseline, directly after (active vs. sham) HD-tDCS, and 30 min after (active vs. sham) HD-tDCS.

    The interference effect is calculated by subtracting the mean reaction time for congruent trials from the mean reaction time for incongruent trials. A larger interference effect reflects worse performance and is suggested to reflect decreased dACC activity.

Other outcomes

  1. Trait impulsivity as measured by the The Short Version of the Urgency, Premeditation, Perseverance, Sensation Seeking and Positive Urgency Impulsive behaviour scale (SUPPS-P)

    Time frame: Baseline

    The SUPPS-P is a widely used robust validated 20-item scale that measures five dimensions of impulsive behavior: negative urgency, premeditation, perseverance, sensation seeking and positive urgency. Participants are asked to indicate how strongly or disagree they agree scale (1 = agree strongly to 4 = disagree strongly) with statements that relate to impulsive tendencies, such as "When I feel bad, I will often do things I later regret in order to make myself feel better now" and "I tend to lose control when I am in a great mood". Higher scores indicate more impulsiveness. For the current study, we used a cut-off score of 47 for high trait impulsivity. This score was determined following analysis of a large database (n = 485) of mental health questionnaires completed by a community sample as part of an ongoing Monash University BrainPark study.

  2. Obsessional Behaviour Questionnaire-44 (OBQ-44)

    Time frame: Baseline

    The OBQ-44 is a validated 44-item questionnaire, that measures the degree of obsessional beliefs. Participants are asked to indicate how strongly or disagree they agree scale (1 = disagree very much to 7 = agree very much) with statements about responsibility/threat estimation (e.g. "harmful events will happen unless I am careful"), perfectionism/certainty (e.g. "I must be certain of my decisions"), and importance/control of thoughts (e.g. "having nasty thoughts means I am a terrible person"). A higher score means participants experience stronger obsessional beliefs.

  3. Intolerance of Uncertainty Scale (IUS-12)

    Time frame: Baseline

    IUS-12 is a short version of the original 27-item Intolerance of Uncertainty Scale that measures responses to uncertainty, ambiguous situations, and the future. The 12 items are rated on a 5-point Likert scale ranging from 1 (not at all characteristic of me) to 5 (entirely characteristic of me). A higher score indicates more intolerance of uncertainty.

  4. Demographic information

    Time frame: Baseline

    Age, Gender, years of education

Sponsors and collaborators

Lead sponsor

Monash University

Other

Collaborators

  • Erasmus University Rotterdam
  • ZonMw: The Netherlands Organisation for Health Research and Development

Registry information

Important dates

Study start
2019
Primary completion
2019
Study completion
2020
First posted
Mar 2, 2020
Registry last updated
May 17, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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